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74 行
1.4 KiB
74 行
1.4 KiB
#pragma once
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#include <stdint.h>
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#include <stddef.h>
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namespace gp{
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namespace _impl{
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constexpr uint32_t uint32_ = 0x01020304;
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constexpr uint8_t magic_ = (const uint8_t&)uint32_;
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}
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wfour-char-constants"
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wmultichar"
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enum class endian : uint16_t
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{
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#ifdef _WIN32
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little = 0,
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big = 1,
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native = little
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#elseif defined(__BYTE_ORDER__)
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little = __ORDER_LITTLE_ENDIAN__,
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big = __ORDER_BIG_ENDIAN__,
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native = __BYTE_ORDER__
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#else
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little = true,
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big = false,
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native = ('ABCD'==0x41424344UL)
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};
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#endif
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#pragma GCC diagnostic pop
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#pragma clang diagnostic pop
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template <typename T>
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T swap_endian(T value)
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{
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union
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{
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T v;
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uint8_t u8[sizeof(T)];
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} src, dest;
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src.v = value;
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for (size_t idx = 0;idx<sizeof(T);idx++)
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{
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dest.u8[idx] = src.u8[sizeof(T)-idx-1];
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}
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return dest.v;
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}
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template<typename T, endian mode = endian::big>
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struct endian_wrapper {
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T value;
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endian_wrapper(){};
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endian_wrapper(T v) : value{
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mode == endian::native ? v : swap_endian(v)
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}{}
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endian_wrapper(endian_wrapper& v) : value{
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v.value
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}{}
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endian_wrapper& operator=(T p) {
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value = mode == endian::native ? p : swap_endian(p);
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return *this;
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}
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operator T(){
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return mode == endian::native ? value : swap_endian(value);
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}
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};
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}
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